A-LevelBiologyGas exchange9700/12 · Feb/Mar 2019 · Q341 Mark

Tobacco smoke contains substances that affect the functioning of the human body. [Table with substances W, X, Y and effects 1, 2, 3] What shows the substances matched with their correct effects?

Aw-1, x-2, y-3

Bw-1, x-3, y-2

Cw-2, x-1, y-3

Dw-3, x-1, y-2

✓ Correct answer

D: w-3, x-1, y-2

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2019 Paper 1 Variant 2, question 34.

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